jsp實現半小時的倒計時頁面 – JAVA編程語言程序開發技術文章

Java代碼 
<%@ page language="java"  pageEncoding="UTF-8"%>  
<p id="leftTime"></p>  
<script>  
      
    var leftTime = <%=Integer.parseInt("1800")%>;  
      
    function showLeftTime(){  
        var leftMinutes = parseInt(leftTime/60);  
        var leftSeconds = parseInt(leftTime%60);  
          
        if(leftTime < 0){  
            clearInterval(timer);  
            document.location.href = document.location.href;  
            //document.getElementById('leftTime').innerHTML = '';  
              
        }else{  
            document.getElementById('leftTime').innerHTML = '&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;如未選擇付費方式 ，剩餘時間小於5分鐘將不允許支付 ，剩餘時間：'+leftMinutes+'分'+leftSeconds+'秒';  
        }  
        leftTime–;  
    }  
      
      
    var timer = setInterval('showLeftTime()',1000);  
      
</script>